import invariant from 'tiny-invariant'
import { TickMath } from './tickMath'

/**
 * Returns the closest tick that is nearest a given tick and usable for the given tick spacing
 * @param tick the target tick
 * @param tickSpacing the spacing of the pool
 */
export function nearestUsableTick(tick: number, tickSpacing: number) {
  invariant(Number.isInteger(tick) && Number.isInteger(tickSpacing), 'INTEGERS')
  invariant(tickSpacing > 0, 'TICK_SPACING')
  invariant(tick >= TickMath.MIN_TICK && tick <= TickMath.MAX_TICK, 'TICK_BOUND')
  if (tickSpacing === 1) return tick
  const rounded = Math.round(tick / tickSpacing) * tickSpacing
  if (rounded < TickMath.MIN_TICK) return rounded + tickSpacing
  if (rounded > TickMath.MAX_TICK) return rounded - tickSpacing
  return rounded
}
